Circuit Documentation

Summary

This circuit integrates various components to perform a set of functions that are controlled by an Arduino Mega 2560 microcontroller. The circuit includes a 4x4 membrane matrix keypad for user input, an LCD 20x4 display with I2C interface for visual output, a DS3231 Real-Time Clock (RTC) for timekeeping, a passive buzzer module for audio signaling, an 8x8 LED matrix for additional visual output, and a KY-026 flame sensor for detecting fire or flame presence. The circuit is powered by a 5V power supply unit (PSU).

Component List

4X4 Membrane Matrix Keypad

• A keypad with 16 buttons arranged in a 4x4 matrix, used for user input.

Lcd 20x4 i2c

• A 20x4 character LCD display with an I2C interface, used for displaying information.

5V PSU

• A power supply unit that provides a regulated 5V output.

Arduino Mega 2560

• A microcontroller board based on the ATmega2560, with numerous digital and analog I/O pins.

DS3231 RTC

• A real-time clock module for maintaining accurate timekeeping.

Passive Buzzer Module

• A module that can produce simple tones or beeps.

8*8 matrix

• An 8x8 LED matrix display for visual output.

KY-026 Flame Sensor

• A sensor module designed to detect flames or fire.

Wiring Details

4X4 Membrane Matrix Keypad

• Rows connected to Arduino Mega 2560 digital pins D37 (R1), D39 (R2), D41 (R3), D43 (R4).
• Columns connected to Arduino Mega 2560 digital pins D45 (C1), D47 (C2), D49 (C3), D51 (C4).

Lcd 20x4 i2c

• GND to common ground.
• 5v to 5V power rail.
• SCA to Arduino Mega 2560 SDA pin.
• SCL to Arduino Mega 2560 SCL pin.

5V PSU

• 5V+ to 5V power rail.
• GND to common ground.

Arduino Mega 2560

• 5V to 5V power rail.
• GND to common ground.
• Various I/O pins connected to other components as detailed in their respective sections.

DS3231 RTC

• VCC to 5V power rail.
• GND to common ground.
• SCL to Arduino Mega 2560 D21/SCL pin.
• SDA to Arduino Mega 2560 D20/SDA pin.

Passive Buzzer Module

• VCC to 5V power rail.
• GND to common ground.
• I/O to Arduino Mega 2560 D3 PWM pin.

8*8 matrix

• VCC to 5V power rail.
• GND to common ground.
• DIN to Arduino Mega 2560 D10 PWM pin.
• CLK to Arduino Mega 2560 D9 PWM pin.
• CS to Arduino Mega 2560 D13 PWM pin.

KY-026 Flame Sensor

• VCC to 5V power rail.
• GND to common ground.
• DO to Arduino Mega 2560 D2 PWM pin.

Documented Code

Arduino Mega 2560 Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Additional Notes

• The provided code is a template and does not include specific functionality. The actual implementation should initialize the connected components and define the main behavior of the circuit within the setup() and loop() functions, respectively.
• The documentation.txt file is empty and thus not included in this documentation.